The FBI arrested the man after he made 22 calls to CNN about a week ago.
The man allegedly told a CNN operator he planned to "gun you all down".
The caller again threatened to come to the Atlanta headquarters to "gun every single last one of you", the affidavit said.
The phone calls were eventually traced and Griesemer was taken into custody. I have more guns than you. Then, according to the affidavit, he said, "I am on my way right now to gun the fuckin' CNN cast down. More manpower. Your cast is about to get gunned down in a matter of hours", the man said in another call. "I'm coming to gun you all down".
Media guard dogs and morals specialists have condemned Trump and partners of the president who parrot his assaults -, best case scenario, saying they are unbecoming of a USA president, and even from a pessimistic standpoint, portraying them as a danger to majority rules system.
The President also retweeted an edited gif which depicts him wrestling a man with a CNN logo on his head. "We take any threats to CNN employees or workplaces, around the world, extremely seriously".
Public records indicate Griesemer was born in 1998.
It was an easy task for the U.S. intelligence agency to trace the call and later, they arrested the man for giving life threats to employees of the news channel. The investigator, using a law enforcement database of phone numbers, found a number linked to Griesemer's father in the Detroit suburb of Novi and gave it a ring.
At one point, the investigator called the number and spoke with someone who identified himself as "Brandon".
This was not the first time Griesemer allegedly made threatening phone calls. "The voices sounded like the same individual", the affidavit states.
Griesemer was at that point on the radar of law-authorization authorities after he brought in dangers to a mosque in Ann Arbor, Michigan, last September. Police tracked the number to the Griesemer house.